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Showing posts with label REDOX TITRATION:. Show all posts
Showing posts with label REDOX TITRATION:. Show all posts
Thursday, August 3, 2023
The number of moles of KMnO 4 reduced by one mole of KI in alkaline medium is:
Answer key : 2
An oxide, X2O3 is oxidized to XO4^− by Cr 2 O 7^2− in acid medium. The number of moles of X2O3 oxidized per mole of Cr2O7^2− is
Answer key: 3/4
One gram of the acid C 6 H 10 O 4 requires 0.768 g of KOH for complete neutralization. How many neutralizable hydrogen atoms are in this molecule?
Answer key : 3
3 g of an oxide of a metal is converted to chloride completely and it yields 5 g chloride. The equivalent weight of metal is:
Answer key : 33.32
A metal carbonate on heating is converted to metal oxide and is reduced to 50% of its original weight. The equivalent weight of the metal is :
Answer key: 14
Friday, April 24, 2020
A 1.0 g impure sample containing [Zn(NH3)4CI2] and some inert impurity was treated with 16 ml of 1.0 M NaOH solution, where all the complex was converted into [Na2Zn(OH)4]. Ammonia formed is first boiled off and then the excess of base required 4 ml of 1.0 M HCI solution for complete neutralisation. After the neutralisation the solution is reacted with excess of AgNO3 solution. the mass of AgCI produced (in mg) is x. The value of x10 is.
Give your Answer........
Calculate the millimoles of SeO3(2−) in solution on the basis of following data: 70 ml of 60/M solution of KBrO3 was added to SeO3(2−) solution. The bromine evolved was removed by boiling and excess of KBrO3 was back titrated with 12.5 mL of 25/Msolution of NaAsO2. The reactions are given below. I. SeO3(2−) +BrO3(−) + H+→SeO42−+Br2+H2O II. BrO3(−) +AsO2(−) + H2O→Br(−) +AsO4(3−)+ H+
Friday, January 31, 2020
50 Cm3 of 0.04 M K2Cr2O7 in acidic medium oxidized a sample of H2S gas to Sulphur . The volume of 0.03 M KMnO4 required to Oxidize the same amount of H2S gas to Sulphur, in acidic medium is.
50ml of KMnO4 is mixed with excess of KI the I2 liberated require 30 ml of 0.1M Na2S2O3 solution calculate the Molarity of KMnO4 solution
829 gm of K2Cr2O7 and H2C2O4 reacts completely with 7/3 moles of K2Cr2O7 . (1) Calculate the moles of each in mixture. (2) Calculate the moles of NaOH required to react with above mixture.
696 gm of Fe2O3 and FeO reacts completely with 158 gm of KMnO4 in acidic medium . Calculate the composition of mixture.
Calculate the Molarity of H2O2 if 11.2 ml H2O2 require 30 ml of 0.5 M K2Cr2O7 for its Oxidation . also calculate the volume of strength of H2O2.
Calculate the moles of KCl which required to produce 10 ml of Cl2 when reacted with KClO3 ?
Calculate the moles of KMnO4 required for Oxidation of 1.25 moles Cu2S.
Calculate the concentration of H2O2 if 20 ml H2O2 Solution react with 10 ml of 2M KMnO4 in acidic medium ?
Calculate the mass of Fe3O4 required to react completely with 25 ml of 0.3 M K2Cr2O7?.
Calculate volume of 0.05 M KMnO4 required to react with 50 ml of 0.1M H2S in acidic medium , given H2S oxidized to SO2?.
Calculate the weight of K2Cr2O7 which reacts with KI to liberate 254 gm of I2 ?.(Cr=51.9961, I=127)
Calculate the moles of KMnO4 required to reacting with 180 gm of Oxalic acid (H2C2O4). Also calculate the volume of CO2 at STP produce in the reaction? (K=39, Mn=55, Of=16)
Tuesday, January 29, 2019
REDOX TITRATIONS:
No of equivalent of A reacted = No of equivalent of B
reacted = No of equivalent of C formed = No of equivalent of D formed
RELATION BETWEEN NORMALITY (N) AND MOLARITY (M):
SOME COMMON OXIDISING AGENT:
SOME COMMON REDUCING AGENT:
ILLUSTRATIVE EXAMPLE (1): Calculate the moles
of KMnO_{4} required to reacting with 180 gm of Oxalic acid (H_{2}C_{2}O_{4}).
Also calculate the volume of CO2 at STP produce in the reaction? (K=39, Mn=55,
Of=16)
SOLUTION:
ILLUSTRATIVE EXAMPLE (2): Calculate the weight of K_{2}Cr_{2}O_{7}
which reacts with KI to liberate 254 gm of I_{2} ?.(Cr=51.9961, I=127)
SOLUTION:
ILLUSTRATIVE EXAMPLE (3): Calculate volume of 0.05 M KMnO_{4} required to
react with 50 ml of 0.1M H_{2}S in acidic medium , given H_{2}S
oxidized to SO_{2}?.
SOLUTION:
ILLUSTRATIVE EXAMPLE (4): Calculate the mass of Fe_{3}O_{4} required
to react completely with 25 ml of 0.3 M K_{2}Cr_{2}O_{7}?.
SOLUTION:
ILLUSTRATIVE EXAMPLE (5): Calculate the concentration of H_{2}O_{2} if
20 ml H_{2}O_{2} Solution react with 10 ml of 2M KMnO_{4}
in acidic medium ?
SOLUTION:
ILLUSTRATIVE EXAMPLE (6): Calculate the moles of KCl which required to produce 10 ml
of Cl_{2} when reacted with KClO_{3} ?
SOLUTION:
ILLUSTRATIVE EXAMPLE (7): Calculate the moles of KMnO_{4} required for Oxidation of 1.25 moles Cu_{2}S.
ILLUSTRATIVE EXAMPLE (7): Calculate the moles of KMnO_{4} required for Oxidation of 1.25 moles Cu_{2}S.
SOLUTION:
ILLUSTRATIVE EXAMPLE (8): Calculate the Molarity of H_{2}O_{2} if 11.2 ml H_{2}O_{2} require 30 ml of 0.5 M K_{2}Cr_{2}O_{7} for its Oxidation . also calculate the volume of strength of H_{2}O_{2}.
ILLUSTRATIVE EXAMPLE (8): Calculate the Molarity of H_{2}O_{2} if 11.2 ml H_{2}O_{2} require 30 ml of 0.5 M K_{2}Cr_{2}O_{7} for its Oxidation . also calculate the volume of strength of H_{2}O_{2}.
SOLUTION:
ILLUSTRATIVE EXAMPLE (9): 696 gm of Fe_{2}O_{3} and FeO reacts completely with 158 gm of KMnO_{4} in acidic medium . Calculate the composition of mixture.
ILLUSTRATIVE EXAMPLE (9): 696 gm of Fe_{2}O_{3} and FeO reacts completely with 158 gm of KMnO_{4} in acidic medium . Calculate the composition of mixture.
SOLUTION:
ILLUSTRATIVE EXAMPLE (10): 829 gm of K_{2}Cr2O_{7} and H_{2}C_{2}O_{4} reacts completely with 7/3 moles of K_{2}Cr_{2}O_{7} .
(1) Calculate the moles of each in mixture.
(2) Calculate the moles of NaOH required to react with above mixture.
ILLUSTRATIVE EXAMPLE (10): 829 gm of K_{2}Cr2O_{7} and H_{2}C_{2}O_{4} reacts completely with 7/3 moles of K_{2}Cr_{2}O_{7} .
(1) Calculate the moles of each in mixture.
(2) Calculate the moles of NaOH required to react with above mixture.
SOLUTION:
ILLUSTRATIVE EXAMPLE (11): 50ml of KMnO_{4} is mixed with excess of KI the I_{2} liberated require 30 ml of 0.1M Na_{2}S_{2}O_{3} solution calculate the Molarity of KMnO_{4} solution.
ILLUSTRATIVE EXAMPLE (11): 50ml of KMnO_{4} is mixed with excess of KI the I_{2} liberated require 30 ml of 0.1M Na_{2}S_{2}O_{3} solution calculate the Molarity of KMnO_{4} solution.
SOLUTION:
ILLUSTRATIVE EXAMPLE (12): 50 Cm^{3} of 0.04 M K_{2}Cr_{2}O_{7} in acidic medium oxidized a sample of H_{2}S gas to Sulphur . The volume of 0.03 M KMnO_{4} required to Oxidize the same amount of H_{2}S gas to Sulphur, in acidic medium is.
ILLUSTRATIVE EXAMPLE (12): 50 Cm^{3} of 0.04 M K_{2}Cr_{2}O_{7} in acidic medium oxidized a sample of H_{2}S gas to Sulphur . The volume of 0.03 M KMnO_{4} required to Oxidize the same amount of H_{2}S gas to Sulphur, in acidic medium is.
SOLUTION:
ILLUSTRATIVE EXAMPLE (13): What volume of 0.4 M Na_{2}S_{2}O_{3} would be required to react with the I_{2} liberated by adding excess of KI to 50 ml of 0.2 M CuSO_{4}? (Ans= 25 ml).
ILLUSTRATIVE EXAMPLE (13): What volume of 0.4 M Na_{2}S_{2}O_{3} would be required to react with the I_{2} liberated by adding excess of KI to 50 ml of 0.2 M CuSO_{4}? (Ans= 25 ml).
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